Gas burning hand tool

Abstract

Burner ( 5 ) for a gas burning hand tool ( 1 ), of the type comprising an elongated burner body ( 21 ), associated at opposite ends of the body with a gas injection zone ( 17 ) and a gas combustion zone ( 19 ). The gas injection zone ( 17 ) comprises at least one outlet orifice ( 35 ) terminating flush on the outside of the periphery ( 25 ) of the burner body ( 21 ), this periphery ( 25 ) promoting the circulation of the gas outside the burner body ( 21 ) to the combustion zone ( 19 ). Gas burning hand tool equipped with a burner of this type.

1. Burner for a gas burning hand tool, comprising:
 an elongated burner body, associated at opposite ends of the burner body with a gas injection zone and a gas combustion zone; 
 at least one branch passage arranged so as to guide a secondary gas circulation from outside a periphery of the burner body to an internal zone of the burner body, in the proximity of a flame control device; and 
 a plurality of gas flow orifices, distributed in a manner corresponding to an opening of the internal zone on a flame capture zone, 
 wherein the gas injection zone comprises at least one outlet orifice terminating flush with an outside of the periphery of the burner body, and the periphery supports circulation of the gas on the outside of the burner body towards the combustion zone, and 
 wherein the flame control device comprises at least one gas flow orifice in fluid communication with the branch passage, said flow orifice being arranged in the proximity of the flame capture zone. 
 
     
     
       2. Burner according to  claim 1 , wherein said periphery comprises an at least partially cylindrical first section close to the injection zone. 
     
     
       3. Burner according to one of  claims 1  and  2 , wherein said periphery comprises an at least partially truncated conical second section close to the combustion zone. 
     
     
       4. Burner according to  claim 3 , wherein the second section has a stepped structure. 
     
     
       5. Burner according to  claim 1 , wherein the gas injection zone has the plurality of outlet orifices, each of the outlet orifices terminating flush on the outside of the periphery of the burner body. 
     
     
       6. Burner according to  claim 1 , wherein the outlet orifice terminates in a gas injection channel, and said channel extends parallel to the external periphery of the burner body at least in the vicinity of the said outlet orifice. 
     
     
       7. Burner according to  claim 1 , wherein the injection zone has a plurality of outlet orifices distributed around the peripheral surface. 
     
     
       8. Burner according to  claim 1 , wherein the injection zone comprises at least one at least partly annular outlet orifice surrounding at least partly the periphery of the burner body. 
     
     
       9. Burner according to  claim 1 , wherein the gas combustion zone has a flame capture zone situated in the vicinity of an end of the burner. 
     
     
       10. Burner according to  claim 9 , wherein the periphery of the burner body promotes a main gas circulation on the outside of the burner body as far as the flame capture zone. 
     
     
       11. Burner according to  claim 9 , wherein the combustion zone further includes the flame control device disposed in the internal zone of the burner body, open at the flame capture zone. 
     
     
       12. Burner according to one of  claims 9  to  11 , wherein the flame capture zone comprises an end face of the burner body. 
     
     
       13. Burner according to  claim 1 , further comprising:
 a flame lighting device disposed in the internal zone of the burner body. 
 
     
     
       14. Burner according to  claim 13 , wherein the flame lighting device comprises a protected site in the internal zone in fluid communication with the internal zone. 
     
     
       15. Burner according to one of  claims 13  and  14 , wherein the internal zone accommodating the flame lighting device is open on the flame capture zone. 
     
     
       16. Burner according to  claim 15 , wherein the at least one branch passage for guiding the secondary circulation of gas from the periphery of the burner body to the internal zone of the burner body is in the vicinity of the flame lighting device. 
     
     
       17. Burner according to  claim 11 , wherein the periphery of the burner body has in the vicinity of the branch passage a deviation portion that removes a part of the peripheral gas flow and guides this part of the flow towards the branch passage. 
     
     
       18. Burner according to  claim 17 , wherein the deviation portion has an annular shape. 
     
     
       19. Burner according to  claim 14 , wherein the flame lighting device is remote from the flame capture zone, and a circulation channel for combustion gas connects the flame capture zone in the vicinity of the flame lighting device. 
     
     
       20. Burner according to  claim 1 , wherein the periphery of the burner body has a zone of inflection, between the injection zone and the combustion zone. 
     
     
       21. Burner according to  claim 20 , wherein the branch passage extends a first section of the burner body, and is open in the vicinity of the zone of inflection. 
     
     
       22. Burner according to  claim 1 , having at least one protective flange projecting outside the periphery of the burner body, and extending from the injection zone to the vicinity of the combustion zone. 
     
     
       23. Gas burning hand tool comprising the burner according to  claim 1 . 
     
     
       24. Hand tool according to  claim 23 , further comprising:
 a gripping handle carrying a gas control lever, and 
 a gas transporting tube connecting the gripping handle to the burner.